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Zinc Anodes

Zinc anodes are commonly chosen for boats operating in salt water, where consistent protection against galvanic corrosion is important for drives, shafts, propellers, and underwater fittings. This collection groups zinc marine anodes across popular locations and brands, helping you match the correct shape and mounting style for your setup.

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Are zinc anodes suitable for all water types?

Zinc is commonly used in salt water, but water type matters. If your boat is mainly in fresh water, magnesium is often chosen, and for brackish or mixed conditions, aluminium is commonly used. The safest approach is to choose based on where the boat spends most of its time, then replace as a set across the same protected system. If you tell us the typical water you boat in and what the anodes fit, it is easier to confirm the best material choice.

How do I match the correct zinc anode to my drive or shaft?

Start with the anode location and what it fits, such as sterndrive plate, ring anode on shaft, prop anode, or hull mount. Confirm the brand and model of the drive or engine where relevant, then match the anode’s shape, thickness, and hole spacing or clamp size. If you have a part number or a clear photo of the old anode, use it to validate. Mount type and dimensions are the quickest way to prevent ordering the wrong item.

Why is my zinc anode not wearing down?

Little to no wear can mean the anode does not have proper contact. Check for paint, heavy oxidation, or loose bolts that create an insulating layer. Also confirm the anode is installed on the correct surface and has direct metal contact. If the boat is mostly in fresh water, zinc may not behave the way you expect, so material choice could be a factor. It is also worth checking whether other anodes are missing, because protection can be uneven if the system is incomplete.

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Zinc anodes, selected to fit first time

Match the mounting style as carefully as the shape

With zinc anodes, the most common issue is not the material, it is the mount. A plate that uses different hole spacing, or a clamp anode with the wrong diameter range, will not seat correctly. Before ordering, note how the anode attaches, then compare the measurements that matter for that mount type. This avoids returns and prevents fitting an anode that has poor contact.

Use zinc consistently across the same protected system

If you are replacing multiple anodes on a sterndrive or shaft system, it is sensible to keep the material consistent rather than mixing types. This helps create more predictable wear and makes it easier to spot abnormal wastage patterns. If you are unsure what was used previously, check old anodes or recent service records and match like-for-like.

Shop Anodes by Type: Hull Anodes | Sterndrive Anodes | Engine Anodes

Fit clean, then inspect at sensible intervals

Anodes need clean metal contact. Remove paint or heavy oxide at the mounting point and tighten fixings evenly. After a few trips, check the anode is still secure and wasting normally. If it disappears unusually fast, investigate possible stray current sources or missing anodes elsewhere, because zinc should wear steadily rather than vanish in weeks.

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